Inhibition Mechanism of Phosphate Ions on Chloride-Induced Crevice Corrosion of Alloy 22

Alloy 22, a nickel-based alloy that belongs to the Ni-Cr-Mo family, shows an outstanding corrosion resistance in most environments. Alloy 22 was extensively studied regarding its crevice corrosion behavior both in pure chloride solutions and in solutions containing other ions such as nitrate, sulfate, and carbonate/bicarbonate. Electrochemical tests were performed to study uniform and localized corrosion of Alloy 22 in a deaerated aqueous...